我正在使用 php 和 mysql 创建一个登录页面，但是在输入电子邮件和密码并提交输入后，浏览器会显示一个空白页面，而无需转到个人资料页面。
如何解决这个错误？？？
登录.php
<?php
$message = "";
if(isset($_POST['email'])!="")
{
require_once('include/connect.php');
$email = $_POST['email'];
$pass = $_POST['pass'];
$email = strip_tags($email);
$pass = strip_tags($pass);
$email = mysql_real_escape_string($email);
$pass = mysql_real_escape_string($pass);
//$pass = md5($pass);
$firstname="";
$email="";
$sql=mysql_query( "SELECT user_id FROM user WHERE email_address='$email'AND password='$pass'LIMIT 1") or die("error in user table");
$login_check = mysql_num_rows($sql);
if($login_check > 0)
{
while($row = mysql_fetch_array($sql))
{
$id = $row['user_id'];
$_SESSION['user_id']= $id;
var_dump($id);
$firstname = $row['first_name'];
$_SESSION['first_name']= $firstname;
var_dump($firstname);
$email = $row['email'];
$_SESSION['email']= $email;
var_dump($email);
mysql_query("UPDATE user SET last_log_date=now() WHERE user_id='$id'");
header("Location: profile.php");
}//close while
}//close if
else
{
$message = "incorrect Email or Password!!";
exit();
}
}//close if
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>RegisterPage</title>
<link href='http://fonts.googleapis.com/css?family=Oswald:400,300' rel='stylesheet' type='text/css' />
<link href='http://fonts.googleapis.com/css?family=Abel|Satisfy' rel='stylesheet' type='text/css' />
<link href="default.css" rel="stylesheet" type="text/css" media="all" />
</head>
<body>
<div id="loginborder">
<p style="color:#FF0000" align="left"><?php print("$message") ?></p>
<!--Login form where user submit his registered email and password-->
<form action="login.php" method="post">
email-address:<br />
<input type="text" name="email" placeholder="Email Adress" />
<br />
<br />
Password:<br />
<input type="password" name="pass" placeholder="Password" />
<br />
<br />
<input type="submit" name="login" value="Login" />
<a href="register.php" style="position: absolute; top: 132px; left: 61px;"> <strong> Register</strong></a>
</form>
</div>
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<div id="footer-bg">
<div id="footer-content" class="container">
<div id="column3">
<h2>About Us</h2>
<ul class="style1">
<li class="first">Lam El Chamel is the first web development system for me, this system had allow me to expand my knowledge and had put me in the first step of the programming career.
Hope that this system will respnd for user's requirements, and as each system it will have a future enhancment with taking into consideration users feedback in the feedback section.
</li>
</ul>
</div>
<div id="column4">
<h2>Navigation</h2>
<ul class="style1">
<li class="first"><a href="index.php">Home</a></li>
<li><a href="#">Map</a></li>
<li><a href="#">Feedback</a></li>
<li><a href="#">Search</a></li>
<li><a href="#">Help</a></li>
</ul>
</div>
</div>
</div>
<div id="footer" class="container">
<p>Copyright (c) 2013 Lam_El_Chamel.zxq.net All rights reserved. Design by Georges Matta.
</div>
</body>
</html>